1.05﹣0.85=
1÷12.5%=
0.625× =
32×298≈
51× =
24×( ﹣ )=
100÷25÷4=
1﹣+= 1÷×= 0.5﹣+0.5﹣=
8.1+= (+)×24= 7××7÷=
19+23=
5﹣1.6=
0.23÷0.1=
0.4×0.2=
=
÷0.25=
0.19+0.76= 8÷= 5-= 0.52÷0.4=
28×= 0.5= ÷= ×=
①367+33=
②9﹣5.2=
③0.6×0.2=
④﹣=
⑤÷=
1.5÷0.05= 8÷0.001= 2.2+8= 31.9-3.09= 3×4÷3×4=
× = 5- + = × = 0.12= 1÷ - ÷1=
树高/m
1
2
3
4
5
影长/m
0.8
1.6
2.4
3.2